FTBFS with sphinx 2.4: cannot import name 'MACRO_DEF'

[Andreas Hasenack]

sed -e 's,[@]LIB_DOOR[@],,g' -e 's,[@]SASL_DL_LIB[@],-ldl,g' -e 's,[@]LIBS[@],-lresolv ,g' -e 's,[@]VERSION[@],2.1.27,g' -e 's,[@]libdir[@],/usr/lib/x86_64-linux-gnu,g' -e 's,[@]prefix[@],/usr,g' -e 's,[@]exec_prefix[@],/usr,g' -e 's,[@]includedir[@],/usr/include,g' < ../libsasl2.pc.in > libsasl2.pc
/usr/bin/sphinx-build -d docsrc/.doctrees -n -q -b cyrman ./docsrc ./man

Extension error:
Could not import extension sphinxlocal.builders.manpage (exception: cannot import name 'MACRO_DEF' from 'sphinx.writers.manpage' (/usr/lib/python3/dist-packages/sphinx/writers/manpage.py))
make[4]: *** [Makefile:1166: man/.sphinx-build.stamp] Error 2
make[4]: Leaving directory '/home/ubuntu/git/packages/cyrus-sasl2/cyrus-sasl2/build-heimdal'
make[3]: *** [Makefile:686: all-recursive] Error 1
make[3]: Leaving directory '/home/ubuntu/git/packages/cyrus-sasl2/cyrus-sasl2/build-heimdal'
make[2]: *** [Makefile:556: all] Error 2
make[2]: Leaving directory '/home/ubuntu/git/packages/cyrus-sasl2/cyrus-sasl2/build-heimdal'
dh_auto_build: error: cd build-heimdal && make -j4 sasldir=/usr/lib/x86_64-linux-gnu/sasl2 returned exit code 2
make[1]: *** [debian/rules:164: override_dh_auto_build] Error 25
make[1]: Leaving directory '/home/ubuntu/git/packages/cyrus-sasl2/cyrus-sasl2'
make: *** [debian/rules:122: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2